<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>后盾人</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        main {
            display: flex;
            height: 100vh;
        }

        main nav {
            background: blue;
            width: 80px;
        }

        main article {
            background: #ddd;
            flex: 1;
        }
    </style>
</head>

<body>
    <main>
        <nav>112
        </nav>
        <article>
            aa
        </article>
    </main>
</body>

</html>